Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/20343
Title: | Self-mated tribological systems based on multilayer micro/nanocrystalline CVD diamond coatings |
Author: | Salgueiredo, E. Abreu, C. S. Amaral, M. Oliveira, F. J. Gomes, J. R. Silva, R. F. |
Keywords: | CHEMICAL-VAPOR-DEPOSITION COATED SILICON-NITRIDE X-RAY-DIFFRACTION NANOCRYSTALLINE DIAMOND ADHESION STRENGTH FILMS PERFORMANCE BEHAVIOR SI3N4 PRETREATMENTS |
Issue Date: | 2013 |
Publisher: | ELSEVIER SCIENCE SA |
Abstract: | The tribological response of multilayer micro/nanocrystalline diamond coatings grown by the hot filament CVD technique is investigated. These multigrade systems were tailored to comprise a starting microcrystalline diamond (MCD) layer with high adhesion to a silicon nitride (Si3N4) ceramic substrate, and a top nanocrystalline diamond (NCD) layer with reduced surface roughness. Tribological tests were carried out with a reciprocating sliding configuration without lubrication. Such composite coatings exhibit a superior critical load before delamination (130-200 N), when compared to the mono- (60-100 N) and bilayer coatings (110 N), considering similar to 10 mu m thick films. Regarding the friction behaviour, a short-lived initial high friction coefficient was followed by low friction regimes (friction coefficients between 0.02 and 0.09) as a result of the polished surfaces tailored by the tribological solicitation. Very mild to mild wear regimes (wear coefficient values between 4.1 x 10(-8) and 7.7 x 10(-7) min(3) N-1 m(-1)) governed the wear performance of the self-mated multilayer coatings when subjected to high-load short-term tests (60-200 N; 2 h; 86 m) and medium-load endurance tests (60 N; 16 h; 691 m). (C) 2013 Elsevier B.V. All rights reserved. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/20343 |
DOI: | 10.1016/j.wear.2013.03.049 |
ISSN: | 0043-1648 |
Publisher Version: | 10.1016/j.wear.2013.03.049 |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Self-mated tribological systems based on multilayer micronanocrystalline CVD diamond coatings_10.1016j.wear.2013.03.049.pdf | 2.51 MB | Adobe PDF |
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